I am passing the value of the button the user clicks on to an array with the following function.
const [pizzaSize, setPizzaSize] = useState("Choose your Pizza Size");
const [startPrice, setStartPrice] = useState(0);
const addPizza = (e) => {
setPizzaSize(e.target.name);
setStartPrice(parseInt(e.target.value));
};
I want to use a custom button component in order to have it toggle on and off, like I have already done with other buttons on the same page.
const ButtonClickable3 = (props) => {
const [isActive, setActive] = useState("false");
const handleToggle = (e) => {
setActive(!isActive);
props.onClick(e)
};
return <button
type="button"
value={props.value}
className={isActive ? "button btn fourth" : "button btn fourthActive"}
onClick={handleToggle}
>
{props.name}
</button>
}
Finally I call the function as follows
<ButtonClickable3 name="test" value="5" onClick={(event) => addPizza(event)}></ButtonClickable3>
When I use a regular button the function works, so I am stumped as to why the custom one does not.
My custom buttons 1 and 2 are also working, but they are using a different function.
I have put my full code on a codesandbox here.
I thank you in advance for your help.
Your original <button has a name attribute, but the <ButtonClickable3 does not. so:
setPizzaSize(e.target.name);
fails with the ButtonClickable3. You need:
return <button
type="button"
name={props.name}
value={props.value}
inside ButtonClickable3.
Related
I have an dropdown menu with buttons for the dropdown elements and pressing them causes an fucntion call.
`
<div className = "dropdown-container">
<button className = "dropdown-button"> Sort </button>
<div className = "dropdown-content">
<button className = "sort-button" onClick={() => changeFilter(['sort=-Covered_distance'])}> Furthest </button>
<button className = "sort-button" onClick={() => changeFilter(['sort=+Covered_distance'])}> Shortest </button>
<button className = "sort-button" onClick={() => changeFilter(['sort=-Duration'])}> Longest </button>
<button className = "sort-button" onClick={() => changeFilter(['sort=+Duration'])}> Fastest </button>
</div>
</div>
Im trying to clean up my code as I have multiple dropdown menus next to each other with the same principle. I thought about making a react component that has the structure of the dropdown menu but as I have an function call in it I need to pass this through also so like.
<div className = "filters-container">
<Dropdown changeFilter = { () => changeFilter() }/>
</div>
Now this works as it calls the function changeFilter(), but none of the params from the other component gets called with the call so it basically calls only changeFilter(), when I press any of the buttons. How can I get the params with the call?
You must pass the argument in the changeFilter prop.
For example:
<div className="filters-container">
<Dropdown changeFilter={() => changeFilter(['sort=-Covered_distance'])} />
</div>
Here's a working example:
https://codesandbox.io/s/falling-currying-kd0oco?file=/src/App.js
The problem here is that when you pass a function as a prop, you can't change their parameters inside the component, the parameter has to be passed from the parent.
Pass the paramter ['sort=-Covered_distance'] in changeFilter function like this:
<div className = "filters-container">
<Dropdown changeFilter={() => changeFilter(['sort=-Covered_distance'])} />
</div
i am trying to make my button disappear if my textarea is empty
until now i have made some code for it but i still cant do it
in the code i am trying to make the css dynamic by having it change accoring to some ternery condition id the condition is met the css will allow the button to work and if not the other css class will turn the button off
my problem is that i want the on/off condition to work only when the textfield has more than one letter ( is not empty ) this will help me in my posting application as it will not post any empty posts instead only posts with letters and words ( non empty textarea) will post
here is the code:
function PostingNow() {
const [post, setPost] = useContext(Mycontext);
const tw = useRef('')
const[count,setCount] = useState(false)
return (
<div >
<textarea placeholder='whats up?' className="box" ref={tw}></textarea>
<button className={count?'tweetbutton':'unclickable'} >
Tweet
</button>
</div>
{post.map((post, i) => (
<Postingcomponent name ='user name'image={Photo} key={i} postContent={post}/>
))}
</div>
);
}
export default PostingNow
You can conditionally render your button in the jsx.
First make your textarea a controlled component so you have access to its state.
Then write
{textAreaText && <button ... />}
Make the textarea to be a controlled input
const [textarea, setTextarea] = useState("")
...
<textarea onChange={e => setTextarea(e.target.value)}>{textarea}</textarea>
Then for the button:
{textarea && <button ... />}
For better UX, it's recommended to disable the button instead of removing it from DOM.
<button disabled={!textarea} ... />
If you make the TEXTAREA tag something like:
<textarea placeholder='whats up?' className="box" ref={tw} class='unclickable'
onkeyup="fixPostButton(this, 'postButton', 'unclickable', 'tweetbutton');">
And make the BUTTON:
<button id="postButton" class="unclickable">Tweet</button>
Then this javascript will change the class after each keystroke:
<script>
function fixPostButton(txta, butn, isempty, notempty) {
var classX = (txta.value == '') ? isempty : notempty ;
document.getElementById(butn).className = classX; }
</script>
I created this search bar for an API. As you can see, the search bar is working with an onChange event. The user is searching the movie thanks to the title. I would like to search a movie with an onClick event with the button. For example, I'm searching Titanic, only this movie must appear.
<form action='/' methode='get' className='Search-Bar'>
<input
type='text'
id='searchbar'
className='searchbar'
placeholder='Rechercher un titre, un réalisateur...'
onChange={(e) => {
setSearchMovie(e.target.value);
}}
/>
<button className='search-button'>
<AiOutlineSearch /> OK
</button>
</form>
This is my code for the filter :
const allMovies = movies
.filter((value) => {
if (searchMovie === '') {
return value;
} else if (value.title.includes(searchMovie)) {
return value;
}
})
.map((movie, index) => {
return ( .............
It's working but I don't know how to search a movie thanks to the button... do you know how can I do this ??
Thank you !
Assuming your onClick is on the button it would be something like this, where you set the value of the movie as the value of the input field.
With your onChange set a value in the component for searchFieldValue and use it with the onClick. Ps your code is only html and JS as far as i can see, not a react related issue.
<button
className='search-button'
onClick={(e) => {
setSearchMovie(searchFieldValue);
}}
>
<AiOutlineSearch /> OK
</button>
I have a function which is handler of onChange and get value of input
and also I have a function for search in an array using searched value coming from that input
and render a component that contains searched array as props.
But I have a problem
when I search it works but after second letter and when the input is empty it shows the last search.
I think it should be handled with useEffect but I dont how to solve or may be I am wrong
I need help to correct that
thanks for your help.
these are my code :
getting search value part and sending as argument :
function BasePage({handleClick, handleSearch }) {
const [searchValue, setSearchValue] = useState('');
useEffect(() => {
function handleChangeSearchInput(e) {
const newSearchValue = e.target.value;
setSearchValue(newSearchValue);
handleSearch(searchValue);
}
})
return (
<div>
<fieldset>
<legend>Search</legend>
<input
value = {searchValue}
onChange = {handleChangeSearchInput}
placeholder = "Enter name to search"
type = "text"
/>
<button onClick={() => handleClick('add-record-form')}>Add</button>
</fieldset>
<br />
{searchValue.length > 0 && <SearchRecord record = {searchValue} />}
</div>
);
}
and this filters in parent component :
function handleSearch(searchValue) {
const searchedTerm = contacts.filter(contact => (contact.name.toLowerCase().includes(searchValue.toLowerCase())));
setSearchTerms(searchedTerm);
}
and I use map to show them .
You shouldn't need useEffect for this. Just have the handler deal with both the setting of state, and the updating.
function handleChangeSearchInput(e) {
const newSearchValue = e.target.value;
setSearchValue(newSearchValue);
handleSearch(newSearchValue);
}
Hi I am new to React and I am a little bit confused on how to validate a value before passing it to the partialRefund function I have.
I am trying to set a simple validation to make sure the value is not empty and numeric before passing it to the partialRefund function.
The first line is the code I currently have. The second line is the code I am trying to write for the validation but it is not working.
Any help would be really appreciated! Thanks!
//Current code
{partialRefundSelected ? <div> <input id={`partial_refund_${order_id}`} type='text'/> <button onClick={() => partialRefund(order_deets_obj,"partialRefund",document.getElementById('partial_refund_'+order_id).value)}> Refund Order </button> </div> : ""}
//Code I am trying to use
{partialRefundSelected ? <div> <input id={`partial_refund_${order_id}`} type='text'/> <button onClick={(validateValue(document.getElementById('partial_refund_'+order_id).value)) => partialRefund(order_deets_obj,"partialRefund",document.getElementById('partial_refund_'+order_id).value)}> Refund Order </button> </div> : ""}
On the second line i am trying to pass a function that will validate the value and the pass it to the partialRefund function. But it doesnt seem to be working :(
Use this:
{
partialRefundSelected ?
<div>
<input id={`partial_refund_${order_id}`} type='text'/>
<button onClick={() => {
const validatedValue=validateValue(document.getElementById('partial_refund_'+order_id).value));
partialRefund(order_deets_obj,"partialRefund",validatedValue);
}}> Refund Order
</button>
</div> :
""}
You can do the validation in the onClick callback if you add curly brackets around the parttialRefund call.
export default function App() {
const partialRefundSelected = true;
const order_id = 1;
const order_deets_obj = { deets: "good deets" };
const partialRefund = (deets, someString, someValue) => {
console.log(deets, someString, someValue);
};
return partialRefundSelected ? (
<div>
<input id={`partial_refund_${order_id}`} type="text" />
<button
onClick={() => {
const value = document.getElementById("partial_refund_" + order_id)
.value;
// Do validation here
if (value === "I LOVE CATS") {
partialRefund(order_deets_obj, "partialRefund", value);
}
}}
>
Refund Order
</button>
</div>
) : (
""
);
}
While this is an option in react, I would suggest making your input a Controlled Component. This would allow you to keep the input's text in state instead of needing to pull the text off of the element after a click. Here is an example.